Response of hybrid rice to different levels of nitrogen and phosphorus

ABSTRACT: The Experiment was carried out at Sher-e-Bangla Agricultural University, Dhaka during November, 2010 to May 2011 to study the response of hybrid rice to different levels of nitrogen and phosphorus. The experiment was laid out on split plot design with three replications having nitrogen levels in the main plot and phosphorus in the sub plot. There were six nitrogen fertilizer levels viz., 0, 80, 120, 160, 200 kg N ha-1, urea super granules @ 75 kg N ha-1 and four phosphorus fertilizer levels viz., 0, 30, 50 and 70 kg P2O5 ha-1. Urea was top dressed in three equal splits at 10, 35 and 55 days after transplanting (DAT). One urea super granules (USG) was placed at 10 cm soil depth at 10 DAT in the centre of four hills in alternate rows @ 75 kg N ha-1. Results indicated that the effect of nitrogen and phosphorus showed significant variation in respect of yield contributing characters and yield. At harvest, maximum effective tillers hill-1 (13.63), filled grains panicle-1 (154.67), 1000 grain weight (29.35 g), grain yield ( 9.42 t ha-1), straw yield (13.33 t ha-1) was obtained from the application of urea super granules. About 10% more grain yield was measured from urea super granules than prilled urea. Phosphorus at 50 kg P2O5 gave the highest grain yield (7.85 t ha-1). Interaction effect showed that application of urea super granules along with 50 kg P2O5 ha-1 gave the highest (9.83 t ha-1) grain yield. On the other hand application of 160 kg N ha-1 and 120 kg N ha-1prilled urea along with 50 kg P2O5 ha-1 gave grain yield as 8.83 t ha-1 and 7.67 t ha-1, respectively.